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POAssociation Proxy SQLAlchemy
 

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    <p><a href="http://docs.sqlalchemy.org/en/latest/orm/extensions/associationproxy.html#creation-of-new-values" rel="noreferrer">This source</a> details how to use association proxies to create views and objects with values of an ORM object.</p> <p>However, when I append an value that matches an existing object in the database (and said value is either unique or a primary key), it creates a conflicting object so I cannot commit.</p> <p>So in my case is this only useful as a view, and I'll need to use ORM queries to retrieve the object to be appended.</p> <p>Is this my only option or can I use merge (I may only be able to do this if it's a primary key and not a unique constraint), OR set up the constructor such that it will use an existing object in the database if it exists instead of creating a new object?</p> <p>For example from the docs:</p> <pre><code>user.keywords.append('cheese inspector') # Is translated by the association proxy into the operation: user.kw.append(Keyword('cheese inspector')) </code></pre> <p>But I'd like to to be translated to something more like: (of course the query could fail).</p> <pre><code>keyword = session.query(Keyword).filter(Keyword.keyword == 'cheese inspector').one() user.kw.append(keyword) </code></pre> <p>OR ideally</p> <pre><code>user.kw.append(Keyword('cheese inspector')) session.merge() # retrieves identical object from the database, or keeps new one session.commit() # success! </code></pre> <p>I suppose this may not even be a good idea, but it could be in certain use cases :)</p>
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